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SI-BONE (NASDAQ: SIBN) officer’s tax sale leaves 130K+ stock units

Filing Impact
(Neutral)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

SI-BONE, Inc. (SIBN) officer Michael A. Pisetsky, SVP, Ops & Adm/Chief Legal Officer, reported selling a total of 3,725 shares of common stock on August 17, 2026, in open-market transactions. According to the disclosure, these sales were required solely to cover tax withholding obligations from vesting restricted stock units under a “sell to cover” arrangement and did not represent discretionary trades. Following these transactions, Pisetsky’s reported holdings include 130,281 shares issuable upon settlement of restricted stock units, each unit representing a contingent right to one share of SI-BONE common stock.

Positive

  • None.

Negative

  • None.
Insider PISETSKY MICHAEL A.
Role SVP, Ops & Adm/Chief Legal Ofr
Sold 3,725 shs ($69K)
Type Security Shares Price Value
Sale Common Stock F1, F2 1,854 $18.6154 $35K
Sale Common Stock F1, F3, F4 1,871 $18.6521 $35K
Holdings After Transaction: Common Stock — 273,650 shares (Direct)
Footnotes (4)
  1. F1. The sale reported on this Form 4 represents shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units. The sale satisfies the tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.
  2. F2. This transaction was executed in multiple trades at prices ranging from $18.545 USD to $18.77 USD; the price reported above reflects the weighted average sale price.
  3. F3. This transaction was executed in multiple trades at prices ranging from $18.55 USD to $18.77 USD; the price reported above reflects the weighted average sale price.
  4. F4. Includes 130,281 shares issuable on the settlement of restricted stock units granted to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.
Shares sold (first transaction) 1,854 shares Common stock sold on August 17, 2026 to cover tax withholding
Price per share (first transaction) $18.6154 per share Weighted average sale price; trades ranged from $18.545 to $18.77
Shares sold (second transaction) 1,871 shares Common stock sold on August 17, 2026 to cover tax withholding
Price per share (second transaction) $18.6521 per share Weighted average sale price; trades ranged from $18.55 to $18.77
Total shares sold 3,725 shares Aggregate of both August 17, 2026 sales reported by the officer
Restricted stock units held 130,281 units Each RSU represents a contingent right to one share of common stock
sell to cover financial
"obligations to be funded by a "sell to cover" transaction"
Sell to cover is when a person who receives company stock through options or awards sells just enough shares immediately to pay required taxes, exercise costs, or fees, keeping the rest. Think of it like cashing part of a bonus to cover the tax bill so you can keep the remainder. For investors, it can create predictable small selling pressure and slightly change the number of shares actually held by insiders without increasing long‑term dilution.
restricted stock units financial
"connection with the vesting of restricted stock units"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
weighted average sale price financial
"price reported above reflects the weighted average sale price"
contingent right financial
"Each restricted stock unit represents a contingent right to receive"

FAQ

What insider transaction did SI-BONE (SIBN) report for Michael A. Pisetsky?
SI-BONE reported that officer Michael A. Pisetsky sold 3,725 shares of common stock on August 17, 2026. The company states these sales were solely to cover tax withholding obligations from vesting restricted stock units under a non-discretionary “sell to cover” arrangement.

At what prices were the SI-BONE (SIBN) shares sold by Michael A. Pisetsky?
The 3,725 SI-BONE shares were sold at weighted average prices of $18.6154 and $18.6521 per share. Footnotes explain the trades occurred in multiple executions within ranges of $18.545–$18.77 and $18.55–$18.77, respectively, in open-market transactions.

Why did Michael A. Pisetsky sell SI-BONE (SIBN) shares according to the Form 4?
The filing states the sales were required to cover tax withholding obligations related to vesting restricted stock units. It further clarifies the transactions were funded by a “sell to cover” mechanism and did not represent discretionary trades by Pisetsky.

How many SI-BONE (SIBN) restricted stock units does Michael A. Pisetsky hold?
After the reported transactions, Pisetsky’s holdings include 130,281 restricted stock units. A footnote explains each restricted stock unit represents a contingent right to receive one share of SI-BONE’s common stock upon settlement, increasing potential future share ownership.

Were the August 17, 2026 SI-BONE (SIBN) insider sales under a Rule 10b5-1 plan?
The Form 4’s Rule 10b5-1 checkbox is not marked as a plan transaction. Instead, the footnotes specify the sales were mandatory “sell to cover” trades solely to satisfy tax withholding from restricted stock unit vesting, rather than discretionary trading.

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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
PISETSKY MICHAEL A.
(Last)(First)(Middle)
C/O SI-BONE, INC.
471 EL CAMINO REAL, SUITE 101
(Street)
SANTA CLARA CALIFORNIA 95050
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
SI-BONE, Inc. [ SIBN ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
SVP, Ops & Adm/Chief Legal Ofr
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/17/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock08/17/2026S(1)1,854D$18.6154(2)275,521D
Common Stock08/17/2026S(1)1,871D$18.6521(3)273,650(4)D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. The sale reported on this Form 4 represents shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units. The sale satisfies the tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.
2. This transaction was executed in multiple trades at prices ranging from $18.545 USD to $18.77 USD; the price reported above reflects the weighted average sale price.
3. This transaction was executed in multiple trades at prices ranging from $18.55 USD to $18.77 USD; the price reported above reflects the weighted average sale price.
4. Includes 130,281 shares issuable on the settlement of restricted stock units granted to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.
Remarks:
/s/ Michael A. Pisetsky08/18/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR